>-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Skip >Except the larger sensor size of the newly announced Kodak and Canon bodies >would be less sensitive, and therefore more compatible with the same lenses >as film cameras? I'm trying to follow and expand on your logic, here. I'm >not sure I get it.
The contrary is the case. When you go further away from the middle of the sensor the angle changes (not perpenticular anymore). How much the angle changes depends on the lens design as well as the focal length of the lens. The final effect depends on the angle and the depth of the detector element. Graphically, it's the best if you think of a detector element as bin with the actual sensor at the bottom. If the light comes right from top it will hit the detector. If it comes from a slight angle only parts of the light hits the bottom. And if the angle is too big no light hits the bottom. The size of the bin determins the resolution. If the bin can hold upto 256 elements (produced by the photons) then the resolution is 8 bits (2^8=256). If the bin can hold 4096 elements then the resolution is 12 bits. If the bin overflows then the elements spill over to the neighbor bins which is called blooming. The term anti-blooming, introduced after CCDs appeared, is the technology to prevent that spill over. Dark noise is a measure of the number of elements per second that end up in the bins although there was no light that could have produced them. Read-out noise etc. is the number elements introduced while the elements are read out, etc. The ratio of the theoretical resolution and all the different noise determins the SNR = Signal to Noise Ratio. The SNR is one of the most important characteristics of a sensor. Hope that helped a bit to understand often used term a bit better. Robert * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
